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Related Concept Videos

Vaporization01:18

Vaporization

38.2K
The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
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Vapor Pressure02:34

Vapor Pressure

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When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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Vapor Pressure Lowering03:28

Vapor Pressure Lowering

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The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

21.5K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
21.5K
Vapor Pressure of Fluid01:28

Vapor Pressure of Fluid

2.0K
The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
2.0K
Distillation: Vapor–Liquid Equilibria01:01

Distillation: Vapor–Liquid Equilibria

4.7K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
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Cervical vaporization in LSIL and persistent HPV infection.

B Navarro Santana1, R Sanz Baro1, R Orozco1

  • 1Deparment of Gynecology and Obstetrics, University Hospital Fundación Jiménez Díaz, Madrid, Spain.

Taiwanese Journal of Obstetrics & Gynecology
|August 21, 2018
PubMed
Summary

CO2 laser vaporization effectively treats persistent high-risk HPV and low-grade cervical lesions. Factors like younger age and condom use improve HPV clearance rates post-treatment.

Keywords:
Cervical VaporizationLSILVPH

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Area of Science:

  • Gynecology
  • Oncology
  • Virology

Background:

  • Persistent high-risk human papillomavirus (HPV) infection and low-grade squamous intraepithelial lesions (LSIL) of the cervix are significant public health concerns.
  • Cervical intraepithelial neoplasia (CIN) grade I that persists for over two years requires effective treatment to prevent progression.
  • CO2 laser vaporization is an established outpatient procedure for managing cervical dysplasia.

Purpose of the Study:

  • To evaluate the efficacy of CO2 laser vaporization in achieving negative cytology and high-risk HPV testing.
  • To identify patient-related factors influencing treatment success rates.
  • To assess the long-term outcomes of CO2 laser treatment for persistent high-risk HPV and LSIL.

Main Methods:

  • A cohort of 124 patients with persistent high-risk HPV or LSIL (CIN I) underwent CO2 laser vaporization between February 2011 and January 2015.
  • Data collected included patient demographics, parity, condom use, oral contraceptive use, smoking status, HPV vaccination, and immune status.
  • Cytology and high-risk HPV testing were performed at 6 months post-treatment, with extended follow-up for a subset of patients.

Main Results:

  • At 6 months, 79% of 116 treated patients achieved negative cytology, and 60% had negative high-risk HPV tests; both normalized in 54%.
  • Negative high-risk HPV testing was significantly associated with younger age (<45 years), non-HPV 16/18 types, nulliparity, and condom use.
  • Among patients with persistent HPV infection and abnormal cytology at 6 months, only 14.7% achieved negative high-risk HPV results by the end of follow-up.

Conclusions:

  • CO2 laser vaporization is a simple, safe, and effective outpatient treatment for persistent high-risk HPV and low-grade cervical lesions.
  • While cytology often normalizes, achieving negative high-risk HPV status requires longer follow-up and may be influenced by specific patient factors.
  • The procedure can be performed without anesthesia, contributing to its practicality and patient acceptance.